Malicious PDF — malware analysis report

Static analysis result for SHA-256 28af674f566646d6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 04:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec30b00e3970e11cd632465665792426 SHA-1: dbdf2d4496338f822a0f3ad2567fd03ecb2d8d1d SHA-256: 28af674f566646d69b5e9080e1735ab63185f14f7796762656c8d52dc995f176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These links are likely used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=58+inches+in+feet PDF link annotation
    • http://chokmanee.com/userfiles/file/88216234616.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa826e3ead4---kipibajenoxe.pdfIn PDF document text
    • http://carszana.com/image/upload/File/71432746130.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/96271410581.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/18692271122.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/56709884366.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9f6cb9524---86845500186.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074789d15f13---novidivavisuponakoran.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b227af1bf---tikurifebake.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/40140515280.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • https://kede.org/userfiles/file/lobetesesisebu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sanaliwejakidemunimimoxul.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/jomami.pdfIn PDF document text
    • http://poultech.net/d/files/50523043663.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8dee4ada8---86211549936.pdfIn PDF document text
    • https://123natura.com/stockages/files/sojigem.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16100442e1e4af---zojoresutanutojivodunu.pdfIn PDF document text
    • https://schmitz.cz/res/file/8161915070.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f705afced02---67846503777.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/72096036505.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/62558732753.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kusijinunawadawat.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/buwukotezesiledi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 17632 bytes
SHA-256: ca68cf3cb26436b522d7dac4b7383ddbede3911cba7923bf6b2eb92a82946b60
font_02_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 10252 bytes
SHA-256: ace8175dd2bd64de1cc23b51f3707b63aa11271bd3892e37c07aed208a12c4bb

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